Internal-combustion engine



Sept; 9. 1924.-

E. 1.. DAVIS INTERNAL COMBUSTION ENGINE Filed July 13 192s Patented Sept. 9, 1924.

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Be i kno n that I,- EWARIIAEEQWti c tize e the Uni d. tates s iesat es Frank-fo e n he mea y oi Fee s: 1in aedStets et' llinois, ha e invented. rtain new nd u efu Imnreverneet in In: emeh-Q mbsstien Engines whi h he lewies-is ssifie tionr This is eetie elates t interest 2913 bustion engines, and has particular reg-tee. engg to the" provision ol' an improved valve operating mechanism employed in such en-' gines.

The primary object of the invention is toprovide a valve operating mechanism embodying rocker arms having their opposite ends directly associated with the cams and valve stems so that the usual push rods are eliminated, thereby lessening the cost and number of parts involved in valve mechanisms of this kind.

Another object of the invention is to provide a valve operating mechanism wherein a minimum number of parts are provided which are liable to require adjustment or renewal, and by means of which efiicient actuation of the valve will be had.

Other objects will appear as the nature of the invention is better understood, and the same consists, in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed.

In the drawings, wherein like reference characters indicate corresponding parts throughout the several views,

Figure l is an end elevation of a valve operating mechanism constructed according to this invention. i

Figure 2 is a fragmentary longitudinal sectional view of the upper end of one of the rocker arms, and

Figure 3 is a fragmentary view, partly in section, and partly in side elevation showing the lower portion of one of the rocker arms and adjacent partsof the engine.

Referring more in detail to the several views, 5 indicates an engine block of any ordinary or preferred construction having a crank case at the lower portion thereof which embodies a removable lower section 6 and in which is j o-urnaled the longitudinal cam shaft 7 having the usual cams fixedthereon for operating the supply and exhaust valves, one of which cams is shown by dotted lines at 8. in Figurel,

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sietathahle teef 9 eeete t fee the esp-1y a d etha e nes s ada ted. he e e ted by the usual mush rqorn valves whose.

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ertllr threesh t? d e the hea as In order to provide a dust-tight joint in se wee said. shaf base tita s em ee snag-t I I the crank case where the lower ends 14 of the rocker arms extend into the same, suitable vertical slides 16 are snugly fitted onto the ends 14 of the rocker arms and mounted for vertical movement in guide ways 17 provided adjacent relatively large slots 18 in the crank case. It will thus be seen that when the rocker arms are actuated, theslide plate 16 will reciprocate inthe guide ways 17 and maintain the slots '18 closed at all times. i v

The valves employed are preferably spring seated outwardly by means of springs 19, in the usual manner, and the upper ends of the rocker arms are provided with inwardly projecting internally threaded bosses aligned with the valve stems 10 and carrying adjustable bolts 20, the inner ends of which engage, the outer ends of thevalve stems 10 so that the valves will be opened and allowed to close at proper .intervals when the rocker arms are actuated by the cams 8.

The bolts 20 are threaded through the bosses of the rocker arms, which bosses are denoted by the reference numeral 21, and

suitable amb, nuts 22 are threaded upon the bolts 20 at opposite ends of the bosses 2'1 for maintaining these bolts in adjusted position. It will thus be seen that by adjusting the bolts 20 inwardly toward the valve stems, any wear which is experienced in the parts of the valve mechanism will be taken up .for eliminating the usual tapping action which occurs in devices of this kind.

From the foregoing description it will be seen that I have provid d a very simple and eflicient form. of valve operating mech anism embodying rocker arms having their ends directly engaged with the actuating cams and the valve stems so that the use of push rods between the rocker arms and the cams is rendered unnecessary. Also, the parts are so disposed as torender access to the same convenient when repair or replacement of parts is found necessary or adjustment required. The rocker arms may be provided with grease cups 23 for lubricating the parts where these rocker arms are mounted upon the shaft 12.

Minor changes may be made without departing from the spirit and scope of the invention as claimed.

What I claim as new is:

In an internal combustion engine, having a cylinder and a crank casing with a cam shaft journaled therein, said crank casing being provided at its side with an opening, a hanger attached to the side of'the cylinder and having a bearing, a rocker arm having a shaft which is journaled in the bearing the rocker arm being provided with a rectangularly disposed extremity which passes through the opening in the side of the crank casing, said extremity being integral with the rocker and operatively engaging the cam shaft, a slide member having a central opening which snugly receives said extremity, guides for holding the slide EDGAR L-EE DAVIS.- 

